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Service station owner's thumb slashed to the bone with sword in robbery

A police strike force has been set up to try and track down three armed thieves targeting service stations in Sydney's north-west.

Nilesh Patel, who owns Speedway at Kings Langley, is recovering from hand surgery after his thumb was sliced to the bone during one terrifying attack.

The 42-year-old was preparing to close the store on Tuesday night when the three men, with dark clothing covering their faces, entered.

One of the men was carrying a small sword, while the others had a pistol and sawn-off shotgun.

Nilesh Patel was slashed with a sword during the robbery. (9NEWS)The Speedway service station in Kings Langley. (9NEWS)

As they helped themselves to cash and cigarettes, the man was the sword accused Mr Patel of pressing the store's panic button.

"The two guys standing next to me, facing in the cigarette cabinet pulling the cigarettes out, they saw that I moved my hand, they saw the movement of the hand and they misunderstood that I pressed the panic button and they attacked me with the sword," he told 9NEWS.

"I felt the blood into my lap and my foot and I saw it was like a fountain, it was coming out like a fountain and everything was about to fall down so I just covered my finger and I just sat down like that and they ran."